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Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment

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Abstract

Hot corrosion is mainly due to the dissolution of protective oxides in the molten salt at the metal surface and their reprecipitation at some other sites as nonprotective porous mass. The hot corrosion attack along the grain boundaries leading to subsurface precipitation of oxides and sulfides also contributes to weakening of material. Ferritic steel with 2.25Cr 1Mo is used widely as a candidate material in the steam generating system of power plants. Hot corrosion studies were conducted on 2.25Cr-1Mo unwelded as well as welded steel specimens with molten salt coated after exposure at 900 °C under cyclic conditions. The thermogravimetric technique was used to establish the kinetics of corrosion X-ray diffraction (XRD); scanning electron microscopy/energy-dispersive analysis (SEM/EDAX) was used to analyze the corrosion products.

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Authors and Affiliations

  1. Metallurgical and Materials Engineering Department, Indian Institute of Technology, Roorkee, Roorkee - 247667, India

    Ravindra Kumar (Research Scholar), V.K. Tewari (Professors) & S. Prakash (Professors)

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  1. Ravindra Kumar
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  2. V.K. Tewari
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  3. S. Prakash
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Correspondence to Ravindra Kumar.

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Manuscript submitted June 2, 2006.

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Kumar, R., Tewari, V. & Prakash, S. Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment. Metall Mater Trans A 38, 54–57 (2007). https://doi.org/10.1007/s11661-006-9053-x

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  • DOI: https://doi.org/10.1007/s11661-006-9053-x

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